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case of RLS, the reference number assigned by the GES shall
not be equal to the last assigned reference number to an RLS
LIDU with the same Q number and addressed to the same AES.
4.5.7.2.3 For DLS, the reference number shall be
released immediately after it is assigned. For RLS, the
reference number shall be released after the GES sends a
transmission status indication LIDU (Table 4-25) to the link
service user in the GES. The GES shall not reassign a released
reference number until all the reference numbers that were
available before its release have been assigned, in accordance
with 4.5.7.2.2, the only exception to that shall be for a
reference number that was assigned to a DLS LIDU mapping
into an LSU, which may be immediately reassigned to anothet
DLS LIDU mapping into an LSU.
4.5.7.2.4 After the assignment of a reference number to
the LDU or upon receipt of circuit-mode LTDU, an SU set
shall be generated according to 4.5.3.2.3. Among all the SUs
awaiting transmission, the oldest of the SUs with the highest
Q number shall always be transmitted first. The ISU or the
RTX SU of an SU set shall be transmitted before the SSUs,
and the SSUs shall be transmitted in the descending order of
their sequence numbers (Appendix 3 to Chapter 4, Item 59).
After the transmission of the complete SU set, the GES shall
do the following:
4.5.7.2.4.1 For K S :
a) If a P channel acknowledgement (PACK) SU (Appendix
2 to Chapter 4, Figure A2-49) indicating no error in
the SU set is received from the AES, the GES shall send
a transmission status indication LIDU indicating success
(Table 4-25) to the link service user in the GES.
b) If a PACK SU (Appendix 2 to Chapter 4, Figure A2-49)
indicating missing SUs in the SU set is received from
the AES and if another PACK SU of the PACK SU set
is not received within tG2 seconds (Appendix 4 to
Chapter 4) from the time the last PACK SU of the
PACK SU set was received, or if no more PACK SUs
identifying missing SUs are expected, the GES shall
transmit a retransmission SU set. The retransmission SU
set shall comprise a retransmission header (KTX) SU
(Appendix 2 to Chapter 4, Figure A2-41 ) followed by
the missing SUs identified in the received PACK SUs of
the PACK SU set. The GES shall then proceed as in
4.5.7.2.4.1 ; however, if a PACK SU indicating missing
SUs in the SU set is received from the AES before the
complete rehansmission SU set has been transmitted, the
GES shall discard the received PACK SU.
c) If a PACK S'U (Appendix 2 to Chapter 4, Figure
A2-49) requesting a complete retransmission of the SU
set is received from the AES, the GES shall retransmit
the entire SU set as a sequence of an ISU and SSUs.
The GES shall then proceed as in 4.5.7.2.4.1
d) If no PACK SU associated with the SU set is received
from the AES within tG1 seconds (Appendix 4 to
Chapter 4) from the time the last SSU of the SU set
(original or retransmitted) was transmitted, the GES
shall transmit a request for acknowledgement (RQA)
SU (Appendix 2 to Chapter 4, Figure A2-27) to the
AES. The GES shall transmit the RQA SU every tG1
seconds from the time the last RQA SU was sent, until
a response is received from the AES, or until the
number of times the RQA SU was sent equals five. If
tG1 seconds elapse after the fifth retransmission of the
KQA SU without receiving any corresponding PACK
SU from the AES, the GES shall send a transmission
status indication LIDU indicating failure (Table 4-25)
to the link service user in the GES and shall cease
processing that SU set; otherwise, the GES shall
proceed as in 4.5.7.2.4.1.
4.5.7.2.4.2 If a PACK SU identifying an SU set which
is not present in the GES is received from an AES, the GBS
shall discard the received PACK SU.
4.5.7.2.5 If there- are no SUs (data or signalling) to be
transmitted, the GES shall transmit an AES system table
broadcast SU (Appendix 2 to Chapter 4, Figures A2-30 to
A2-34), if one has been generated from an LIDU received
from the GES management; otherwise, the GES shall h-ansmit
a fill-in SU (Appendix 2 to Chapter 4, Figure A2-42).
Annex 10 - Aerunautical Telecommunications
4.5.7.3 AIRCRAFT EARTH
STATION (AES)
4.5.7.3.1 Upon receipt of an SU set comprised of an
LSU, the AES shall form an LIDU according to 4.5.3.2.4 and
pass it to the appropriate link service user in the AES. For an
LSU using RLS, the AES shall then send a PACK SU indicating
no error to the GES. The AES shall command the selection
of an R channel frequency and then shall resend that
PACK SU if an RQA SU identifying this SU set is received
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